var http  = require('http');
var fs    = require('fs');
var path  = require('path');
var mime  = require('mime');
var cache = {};

function send404(response) {
  response.writeHead(404, {'Content-Type': 'text/plain;charset=UTF-8;'});
  response.write('Error 404: 没找到您要的资源...');
  response.end();
}

function sendFile(response, filePath, fileContents) {
  response.writeHead(200,{"content-type": mime.lookup(path.basename(filePath))});
  response.end(fileContents);
}

function serveStatic(response, cache, absPath) {
	if (cache[absPath] && 1==2) {
	   sendFile(response, absPath, cache[absPath]);
	}else{
	   fs.exists(absPath, function(exists) {
		    if (exists) {
				 fs.readFile(absPath, function(err, data) {
					 if (err) {
						send404(response);
					  } else {
						  cache[absPath] = data;
						  sendFile(response, absPath, data);
					  }
				 });
			}else{
			    send404(response);	
			}
	   });
	}
}

var server = http.createServer(function(request, response) { 
  var filePath = false;
  if (request.url == '/') {
    filePath = 'public/index.html'; 
  } else {
    filePath = 'public' + request.url; 
  }
  var absPath = './' + filePath;
  serveStatic(response, cache, absPath); 
});

server.listen(2012, function() {
	 console.log("Server listening on port 2012.");
});

var chatServer = require('./lib/chat_server');
chatServer.listen(server);